TY  - JOUR
AU  - Agnès Chounet, Martin Vallée
PY  - 2018//
TI  - Global and Interregion Characterization of Subduction Interface Earthquakes Derived From Source Time Functions Properties
KW  - global earthquake seismology radiated energy seismic coupling source time functions stress drop subduction earthquakes
N2  - Source time functions (STFs) describe how the seismic moment rate is released with time, and carry information on integral rupture properties, such as static stress drop and radiated energy. In this study, we systematically analyze a set of 1,433 STFs extracted from the SCARDEC method (Vallée and Douet, 2016, https://doi.org/10.1016/j.pepi.2016.05.012), containing the Mw≥5.6, shallow (z≤70 km) earthquakes with dip-slip mechanism that occurred between 1992 and 2014. At the global scale, STFs properties indicate scale invariance of stress drop and scaled radiated energy with magnitude. In a second step, these source parameters are investigated in light of the tectonic context of the earthquakes: in agreement with other approaches, we observe that subduction interface earthquakes have lower stress drop and scaled radiated energy relative to all other earthquakes (e.g., crustal earthquakes). Finally, a focus on subduction interface earthquakes (approximately 800 earthquakes) is done by considering 18 regional segments of subduction zones. We find that these segments do not have the same signature in terms of macroscopic rupture properties, which means that large-scale plate convergence and mechanical properties influence rupture behavior. In a given segment, local heterogeneities of stress drop or radiated energy can be associated with local features of the subduction zone: in particular, we find that low coupled zones generate earthquakes with low stress drop and scaled radiated energy. This last feature, also observed at a larger scale, suggests a positive correlation between coupling and stress drop.
SN  - 2169-9356
SN  - 2169-9356
UR  - http://dx.doi.org/10.1029/2018JB015932
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=7383), last updated on Sat, 29 Jun 2024 13:49:42 +0200
ID  - AgnesChounet2018
ER  -